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Which are used when audible and visual signals are not successful?

Which are used when audible and visual signals are not successful?

جب قابل سماعت اور بصری سگنل کامیاب نہیں ہوتے ہیں تو کون سا استعمال ہوتا ہے؟
Explanation
  • Pheromones are chemical signals used by animals to communicate when audible or visual signals are ineffective.
  • This often in dark or dense environments.
  • These signals can convey information about territory, mating, or warning messages.